Should Elastic Search be reindexed if I make any configuration changes to Logstash

Hi
If I make any configuration changes to Logstash.
Will I see the chnages applied to Elastic Search
For Example
If I change the grok pattern and added new Fields,
Will I be able to see the chnages effected on already indexed logs.

If not what should I do?
Should I re-index whole old logs which are already indexed again to see the new fields??

Yes, is you change the logstash filters to add new fields you will need to re-index data to see the new fields on old documents.

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